From a goal to a plan
Describe what you want. CodeLynq proposes the tasks and how they depend on each other, as real tasks you can edit, reorder and approve individually. Nothing starts until you approve it.
Parallel where the graph allows
Every task whose dependencies have landed starts at the same time, so an epic takes about as long as its longest chain rather than the sum of its parts. With three independent tasks, that is three pull requests opening together instead of one after another.
How wide it goes is bounded by your plan's concurrent-run limit, which is also your spend ceiling. You can cap an individual epic lower, or set it to one to keep it strictly sequential.
When something fails
The epic pauses and stops its siblings. Work started on the assumption that a failed task would land is usually work you have to redo, so continuing to pay for it makes no sense. Cancelled tasks return to approved, and resuming relaunches them.
Parallel branches can conflict once the first pull request merges. Where you have auto-iterate enabled, the conflicting branch is rebased and resolved automatically rather than waiting for someone to notice.